we propose an uncertainty in salinity of 0.04 %© for these 

 tabulated values. 



Necessary corrections liave been applied to the tabulated values 

 appearing in the Table of Oceanographic Data and have been con- 

 sidered in the construction of the dynamic topographic charts. 

 Temperature control of the samples in the electrolytic cells of the 

 Coast Guard's Wenner bridge limit the precision of the individual 

 measurements to 0.005°/oo. In view of the precise chlorinity deter- 

 minations of February 1960 and the check runs on the calibration 

 curve, it would appear that the salinities measured with the Coast 

 Guard Wenner bridge were measured with an accuracy of about 



±0.005%o. 



Dissolved oxygen determinations were conducted as in 1961 accord- 

 ing to the method described by Jacobsen, J. P., et al.* as modified 

 slightly by the Woods Hole Oceanographic Institution.^ Samples 

 for dissolved oxygen were taken at all levels except the surface at 

 stations 8300 through 8378 and at all levels, including the surface, at 

 stations 8379 through 8386. Xansen type water bottles with teflon- 

 coated interiors were used for sampling, with the exception of the 

 591 meter level at station 8307 where a silver-lined Nansen bottle 

 was used. The samples were chemically treated and stored until 

 analysis in ISO-milliliter glass bottles for stations 8300 through 8352, 

 8355, 8360, 8364, and 8368; 275-millihter glass bottles were used for 

 the remainder of the stations. The sodium thiosulfate solution was 

 standardized daily with a previously prepared potassium bi-iodate 

 solution. Aliquot samples of tlie treated sea water were withdrawn 

 by a 50-ml automatic pipette and titrations were made with a 10-nd 

 burette. The precision is generally considered to be ±0.03 ml/liter; 

 however values marked ? in the tables are somewhat questionable and 

 the dissolved oxygen content for tliese values is considered to be 

 accurate only to ±0.10 ml/liter. 



Saturation values were determined from the nomograms of Richards 

 and C^orwin," which is based on the oxygen saturation values of 

 Truesdale, et al.^ Since this nomogram is constructed for a minimum 

 temperature of only 0° C, it was necessary to extrapolate the nomo- 

 gram for the many negative temperatures found. Some personnel of 

 the W^oods Hole Oceanographic Institution now question the validity 

 of Truesdale's values and believe the tables prepared by Fox^ to be 



* Jacobsen, T. P., Hex J. Robinson and Thomas G. Thompson. A review of the determination of dis- 

 solved oxygen in sea water by tiie Winlcler method, t'nion Oeodes. et Geopliys. Int., Assoc d'Oceanog. 

 Phys., Pub. Scientif. No. 11, 1950. 



5 Personal communication from Dayton E. Carritt. 



« Richards, Francis A. and Nathaniel Corwin. Some oceanographic applications of recent determinations 

 of the solubility of oxygen in sea water. Limnol. and Oceanog., Vol. 1, pp. 263-267, 1956. 



7 Truesdale, G. A., A. L. Downing and O. F. Lowden. The solubility of oxygen in pure water and sea 

 water. J. Appl. Chem. Vol. 5(2), pp. 53-62, 1955. 



' Fox, C. J. J. On the coefficients of absorption of nitrogen and oxygen in distilled water and sea water 

 and of atmospheric carbonic acid in sea water. Faraday Soc. Trans. Vol. 5, pp. 68-87, 1909. 



34 



